Modern agriculture faces the compounding threats of climate change, land degradation, and the urgent need to feed a growing global population. Farmers are increasingly battling abiotic stresses such as severe drought and rising soil salinity which threaten to destabilize food systems. In a comprehensive review published in the Journal of Agricultural Policy and Transformation, Ibrahim Musa Osman and colleagues synthesized fifteen years of research to evaluate the efficacy of biochar as a sustainable solution. Their findings suggest that this carbon-rich byproduct of burning organic matter is not merely a waste management tool but a critical soil amendmentA soil amendment is any material added to the soil to enhance its physical or chemical properties, improving its suitability for plant growth. Biochar is considered a soil amendment as it can improve soil structure, water retention, nutrient availability, and microbial activity.   More capable of fortifying crops against extreme weather while mitigating environmental damage.

The primary advantage of biochar lies in its ability to physically transform the soil matrix. Produced through pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More, the thermal decomposition of biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More in low-oxygen environments, biochar retains a highly porous structure. This structure allows it to function effectively as a sponge within the soil ecosystem. Research indicates that in coarse-textured soils like sand, which typically suffer from rapid drainage, fine-grained biochar fills large pores to significantly increase water-holding capacity. By maintaining higher moisture levels, biochar directly reduces the irrigation demand and alleviates the physiological strain on crops during dry spells. This physical improvement is critical for maintaining root water potential, which allows plants to continue water uptake even when external conditions become arid.

Beyond water retention, biochar serves as a chemical buffer against salinity, a condition that disrupts the ion balance in plants and hinders growth. The review highlights that biochar possesses a high cation exchange capacity, enabling it to adsorb toxic sodium ions from the soil and prevent them from damaging plant tissues. Simultaneously, the material releases beneficial ions such as potassium, calcium, and magnesium, which compete with sodium for uptake sites and help maintain cellular osmotic balance. This dual mechanism not only reduces toxicity but also supports better biomass production and photosynthetic activity under stress. Furthermore, biochar application has been linked to a reduction in the production of reactive oxygen species and the modulation of stress hormones like abscisic acid, further enhancing a plant’s physiological defense systems.

The environmental implications of biochar extend to climate change mitigation and ecosystem health. Unlike traditional fertilizers that may degrade quickly, biochar is stable and sequesters carbon in the soil for extended periods, effectively removing carbon dioxide from the atmosphere. The review notes that biochar also interacts with soil nitrogen cycles to reduce the emission of nitrous oxide, a potent greenhouse gas. By adsorbing ammonium nitrogen, it prevents nutrient leachingLeaching is the process where nutrients are dissolved and carried away from the soil by water. This can lead to nutrient depletion and environmental pollution. Biochar can help reduce leaching by improving nutrient retention in the soil.   More into groundwater, thereby protecting aquatic ecosystems from pollution and runoff. This creates a circular benefit where soil health is restored, and the environmental footprint of intensive farming is significantly lowered.

Despite these clear benefits, the transition to biochar-integrated farming faces economic and logistical hurdles. The review identifies high initial production costs and market volatility as significant barriers to entry for farmers. Additionally, the quality of biochar varies significantly depending on the feedstockFeedstock refers to the raw organic material used to produce biochar. This can include a wide range of materials, such as wood chips, agricultural residues, and animal manure. More and production method used, making it difficult to create standardized recommendations for different soil types. The benefits of biochar are highly context-specific and can decline over time as the material ages in the field or if applied excessively. To bridge the gap between research potential and field application, the authors emphasize the need for supportive policies, such as subsidies and standardized product guidelines, to encourage scalable adaptation.

Source: Osman, I. M., Acar, R., Direk, M., & Kiendrebéogo, A. (2025). Eco-Friendly Biochar for Stress Mitigation and Sustainable Crop Farming. Journal of Agricultural Policy and Transformation, 1(1), 27–33.